19A bbhosted.cuny.edu3) Dependent-measures t-test. A psychologist wants to determine whetherpsychoeducation decreases the level of stigma in patients that are clinically high risk ofdeveloping psychosis. She examines the level of stigma before and after on 5participants. Use the data below to determine whether there is a significant difference inthe stigma levels before and after implementing psychoeducation. Test with alpha = 0.05providingBefore Psychoeducation After Psychoeducation6.78.6.76.2a. Conduct a complete hypothesis testb. Compute rc. Give a full APA-style write up of your resultsd. Do you have to consider a Type I error or a Type II error? Explain3. bbhosted.cuny.edu5) For each of the following research excerpts, give the following information:(1) The type of hypothesis test conducted (one-sample t-test, independent-measurest-test, or dependent-measures t-test)(2) The n(3) Was the decision to reject the null hypothesis or to fail to reject the nullhypothesis(4) The obtained t-value(5) the type of error possibly being madea) The data indicates the average time spent on homework for undergraduate students inExperimental Psychology is significantly different from the population, t(75) =1.50,p<0.05.b) Students who created the cheat sheet for Exam 3 had a significantly higher score (M =92, SD = 5) than students who did not create the cheat sheet (M = 82, SD = 10), t(21) =8.50, p<0.05.%3D

Answered: 3) Dependent-measures t-test. A…

Holt Mcdougal Larson Pre-algebra: Student Edition 2012

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Author:HOLT MCDOUGAL

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Chapter11: Data Analysis And Probability

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19
A bbhosted.cuny.edu
3) Dependent-measures t-test. A psychologist wants to determine whether
psychoeducation decreases the level of stigma in patients that are clinically high risk of
developing psychosis. She examines the level of stigma before and after on 5
participants. Use the data below to determine whether there is a significant difference in
the stigma levels before and after implementing psychoeducation. Test with alpha = 0.05
providing
Before Psychoeducation After Psychoeducation
6.
7
8.
6.
7
6.
2
a. Conduct a complete hypothesis test
b. Compute r
c. Give a full APA-style write up of your results
d. Do you have to consider a Type I error or a Type II error? Explain
3.

bbhosted.cuny.edu
5) For each of the following research excerpts, give the following information:
(1) The type of hypothesis test conducted (one-sample t-test, independent-measures
t-test, or dependent-measures t-test)
(2) The n
(3) Was the decision to reject the null hypothesis or to fail to reject the null
hypothesis
(4) The obtained t-value
(5) the type of error possibly being made
a) The data indicates the average time spent on homework for undergraduate students in
Experimental Psychology is significantly different from the population, t(75) =1.50,
p<0.05.
b) Students who created the cheat sheet for Exam 3 had a significantly higher score (M =
92, SD = 5) than students who did not create the cheat sheet (M = 82, SD = 10), t(21) =
8.50, p<0.05.
%3D

Expert Solution

Step 1

Since you have asked multiple question, we will solve the first question for you. If you want any specific question to be solved then please specify the question number or post only that question.

Before, x	After, y	d=x-y	$d - d$	${(d - d)}^{2}$
9	7	2	-0.8	0.64
8	5	3	0.2	0.04
6	3	3	0.2	0.04
7	5	2	-0.8	0.64
6	2	4	1.2	1.44
Total		14		2.8

Then,
$\begin{array}{rcl} d & = & \frac{\sum_{i = 1}^{5} d}{5} \\ = & \frac{14}{5} \\ = & 2.8 \\ s_{d} & = & \sqrt{\frac{\sum_{i = 1}^{5} {(d - d)}^{2}}{5 - 1}} \\ = & \sqrt{\frac{2.8}{4}} \\ = & \sqrt{0.7} \\ = & 0.8367 \end{array}$

Step 2

To test
$H_{0} : μ_{d} = 0 H_{1} : μ_{d} \neq 0$

The test statistic is
$\begin{array}{rcl} t & = & \frac{d}{s_{d} / \sqrt{n}} \\ = & \frac{2.8}{0.8367 / \sqrt{5}} \\ = & \frac{2.8}{0.37418} \\ = & 7.4830 \end{array}$

Step 3

$\begin{array}{rcl} T h e d e g r e e o f f r e e d o m & = & n - 1 \\ = & 5 - 1 \\ = & 4 \end{array}$

Then, the critical value at $α = 0.05 i s 2.776$ .

Since, $t h e v a l u e o f t - s t a t i s t i c > 2.776, r e j e c t H_{0} .$

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